[#100] Added function to include shaders as const string, refactored temporary file usage

.gitignore

config/Libraries.cmake

config/Sources.cmake

config/ext/IncludeShader.cmake

include/vkcv/File.hpp

modules/shader_compiler/src/vkcv/shader/GLSLCompiler.cpp

modules/upscaling/CMakeLists.txt

modules/upscaling/config/FidelityFX_FSR.cmake

modules/upscaling/include/vkcv/upscaling/FSRUpscaling.hpp

modules/upscaling/src/vkcv/upscaling/FSRUpscaling.cpp

src/vkcv/File.cpp